ANNULAR BARRIER WITH MECHANISM OF AXIAL FORCE APPLICATION Russian patent published in 2016 - IPC E21B33/127 

FIELD: pipes.

SUBSTANCE: group of inventions relates to annular barriers designed for insulation, well systems and related methods for opening annular barriers. Annular barrier includes tubular part, elongated in longitudinal direction for installation as a part of well tubular structure; expanding sleeve surrounding tubular part and confining space connected thus to enable fluid transfer with inner space of tubular part; first passage for fluid designed for fluid inlet in the space for coupling opening; and connecting module containing connecting part connected to slide with tubular part, wherein the first end of expanding sleeve is connected with connecting part; fixed part rigidly connected with tubular part; and drive mechanism to apply axial force to the first end of expanding sleeve, as a result, the connecting part is displaced in lengthwise direction towards the second end of expanding coupling connected with tubular part; drive mechanism additionally comprises pressure chamber formed by at least partially between the surface of connecting part and surface of fixed part, and the second passage for fluid medium designed for fluid inlet into pressure chamber to provide connecting part puhing in longitudinal direction; in coupling part there is the first fluid passage connecting with the possibility of fluid transfer space limited by expanding coupling and pressure chamber.

EFFECT: technical result consists in preventing undesired thinning of expanding coupling.

17 cl, 13 dwg